Loudspeaker



FIG. 1 is a front perspective view of my design, showing also one side thereof;

FIG. 2 is a rear perspective view of my design, showing also the same side as in FIG. 1;

FIG. 3 is an elevation showing the side not visible in FIGS. 1 and 2;

FIG. 4 is a top plan view of my design; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a loudspeaker, substantially as shown and described. 